Kindergartners in the Windy City will learn about male and female anatomy, as well as reproduction. By the time they are enrolled in third or fourth grade, they will have received lessons on puberty, HIV/AIDS and what constitutes inappropriate touching.

Chicago Public Schools CEO Barbara Byrd-Bennett released a statement about the decision:

It is important that we provide students of all ages with accurate and appropriate information so they can make healthy choices in regards to their social interactions, behaviors and relationships.”

Despite the new curriculum, parents will be able to remove their kids from the program if they like.

Chicago has 431,000 students, making it the nation’s third-largest school district.